Zigzag amplifier consisting of a prism with two tilted ends, shown in the gain coordinate system. the ray is refracted at both faces. The entrance face is drawn in green and the exit face is drawn in red. A configuration of ten reflections is shown. The start and end of the center ray is indicated as well as the front and back of the zigzag amplifier. For this case, the ray enters the front.

Zigzag amplifier consisting of a prism with two tilted ends, shown in the beam coordinate system.